I have a Colt 16" HBAR with F marked front sight. bayo lug and threaded barrel with M4 feed ramps. It is marked 1/9 HBAR. I bought this new about a year ago and it has around 200 rounds through it. I am looking for a Colt M4 barrel, either 14.5" or 16", in like condition. Please e-mail me at firstname.lastname@example.org with offers.